It’s all about position, lighting, and a steady hand (so no hypos while trying to use the Scanner! Haha!). You want good overall lighting, but avoid disturbing reflections or shadows on the screen of your meter.
Bring up the first reading in meter memory that you want to import, then align your meter with the guides as best as you can. Once importer grabs the first value, use the appropriate button on your meter to display the next value. Click through until all the values are imported. As Scanner starts picking up your readings you'll find yourself going faster and faster until it’s second nature.